When a piece of sodium metal is added to ethanol, the gas formed with effervescence is .............

CO₂

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N₂

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O₂

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H₂

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Solution

The correct option is D
H₂

When sodium metal is dropped into a test tube containing ethanol, sodium ethoxide is formed with the evolution of hydrogen gas. This is a characteristic reaction of alcohols, where the alcohol reacts with sodium metal to form the corresponding alkoxide and hydrogen gas.

$2 C_{2} H_{5} O H + 2 N a \to 2 C_{2} H_{5} O N a + H_{2}$

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A small piece of calcium metal is put into a small trough containing water. There is effervescence and white turbidity is formed.

(a) Name the gas formed in the reaction. How would you test the gas ?

(b) Write an equation for the reaction.

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